制备高效的OER电催化剂对水裂解制氢至关重要.具有丰富配位构型的MOFs可以衍生出各种优良的电催化材料.由于石墨炔(GDY)具有独特的可控合成特性,我们将其原位复合在MOF衍生的Co3S4/NF材料上,获得了自支撑电极GDY/Co3S4/NF,大大提高了其OER催化性能.研究表明,GDY/Co3S4/NF在10 mA cm-2电流密度下表现出223 mV的低过电位,在100 mA cm-2的大电流密度下,能够稳定电解45小时左右,该材料显示出了巨大的实际应用潜力.结果表明,由于GDY独特的炔键和大孔结构,它可以通过强电子相互作用与Co3S4相互作用,从而调节电子结构并提供有效的电荷转移通道,从而大大提高了其电催化OER的性能.
Stabilization of MOF-derived Co3S4 nanoparticles via graphdiyne coating for efficient oxygen evolution
Developing a facile approach to fabricate robust electrocatalysts for the oxygen evolution reaction(OER)is essential for water electrolysis for hydrogen production.Transition metal-organic frameworks(MOFs),with their di-verse coordination geometries,offer a promising avenue for deriving materials with excellent electrocatalytic properties.Leveraging the distinct controllable synthesis features of two-dimension graphdiyne(2D-GDY),we herein present a novel strategy:Loading GDY in situ onto a MOF-derived Co3S4/nickel foam(NF)material to create a self-supported electrode,GDY/Co3S4/NF,exhibiting significantly enhanced electro-catalytic performances for OER.Our comprehensive in-vestigation reveals that GDY/Co3S4/NF demonstrates superior performance,with a low overpotential of 223 mV at a current density of 10 mA cm-2 and a small Tafel slope of 46.5 mV dec-1.Notably,it showcases exceptional stability over 45 h of continuous electrolysis at a high current density of 100 mA cm-2 under alkaline conditions,highlighting its pro-mising practical applicability.These results validate that the unique acetylene bonds and macroporous structure of 2D-GDY enable strong electronic interactions with Co3S4,thereby tuning the electronic configuration,facilitating efficient charge transport channels,increasing active surface areas,and enhancing durability.Furthermore,in-situ attenuated total reflection surface-enhanced infrared spectroscopy(in-situ ATR-SEIRAS)analysis reveals that the synergistic effect be-tween GDY and Co3S4 promotes the adsorption of crucial intermediate species such as OOH*,thereby significantly im-proving the electrocatalytic activity for OER.This work pre-sents a facile and efficient strategy for constructing advanced nanomaterials with extraordinary electrocatalytic perfor-mance,offering promising prospects for various practical applications.
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